RFR: 8302831: PPC: compiler/codecache/TestStressCodeBuffers.java fails after JDK-8301819

[Richard Reingruber]

`emit_call_with_trampoline_stub()` can fail because the code cache is exhausted.
This pr adds failure checks to callers.

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Commit messages:
 - Update copyright year
 - Add compilation failure checks

Changes: https://git.openjdk.org/jdk/pull/12685/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12685&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302831
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12685.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12685/head:pull/12685

PR: https://git.openjdk.org/jdk/pull/12685